Plans and regulations, like protecting marine areas or guiding activities such as fishing and offshore development, is crucial for a cross-national marine planning tool. It helps countries work together, ensuring plans fit well across borders and reducing conflicts. Understanding each country's rules keeps things consistent in managing marine activities, aligning the overall plan with individual country policies. Including national plans in the tool allows for a holistic approach, considering various activities alongside conservation efforts for a balanced and sustainable approach.

National data helps identify suitable areas for specific activities based on rules, promoting efficient use of marine space while respecting legal and ecological considerations. Knowing national plans aids in assessing potential environmental impacts accurately, crucial for minimizing negative effects on marine ecosystems.

Using national data fosters better engagement with stakeholders, like government agencies and industries, promoting collaboration and minimizing conflicts. National data provides insights into adjusting plans based on changes in rules, technology, or new scientific knowledge. Considering national plans helps identify and reduce risks associated with marine activities, contributing to a more resilient spatial planning approach.

Integrating national plans ensures the tool follows legal frameworks, crucial for international cooperation and addressing legal challenges. National data helps set common data formats and quality standards, making it easier to integrate information across borders into the cross-national marine planning tool.